Fig. 2. Remaining mass of bentazon and imidacloprid as a function of time as measured in laboratory incubation studies at different temperatures using soil from the experimental field. (A) Bentazon in the 0- to 30-cm layer, (B) imidacloprid in the 0- to 30-cm layer, (C) bentazon in the 40- to 70-cm layer, (D) imidacloprid in the 40- to 70-cm layer, (E) bentazon at 10°C in the 80- to 120-cm layer, and (F) imidacloprid at 10°C in the 80- to 120-cm layer. The points are the measurements and the lines are fits assuming first-order kinetics. In the calculation of the fitted lines for 15 and 25°C in (B), all measurements later than 100 d were ignored.